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標題: | 鉑鈀合金奈米粒子對三碘離子還原反應催化的探討 Enhancing the Catalytic activity of Tri-iodide Reduction by Tuning the Surface Electronic Structure of PtPd Alloy Nanocrystals |
作者: | Keh-Jiunh Chou 周克駿 |
指導教授: | 周必泰(Pi-Tai Chou) |
關鍵字: | 鉑鈀合金,奈米粒子,染敏電池,三碘離子還原反應, Platinum Palladium alloys,nanoparticle,dye-sensitized solar cell,tri-iodide reduction reaction, |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 不同合金比例的鉑鈀奈米粒子成功地以化學方法合成,並且進一步應用於染敏電池的對電極。電池效率量測上,應用元件的表現與對電極合金比例息息相關,所呈現的趨勢為 Pt5Pd5 > Pt7Pd3 > Pt3Pd7 > Pt1Pd9。在此系列材料中,使用Pt5Pd5奈米粒子作為對電極的元件所展現的能量轉換效率高達9.8 %,其表現優於使用Pt薄膜作為對電極的參考元件所得到的效率7.6 %。我們更進一步採用多種電化學量測來進行探討,發現元件電解液中碘離子與三碘離子的自身氧化還原反應的催化會受到鉑鈀材料合金比例影響,且材料催化活性趨勢與其相對應元件間的能量轉換效率趨勢相同。此外,我們以理論計算推估此氧化還原對在不同合金表面的吸脫附行為,可以再次驗證出一致的催化活性趨勢。結合電化學量測及理論計算結果可以清楚說明鉑鈀奈米材料的合金比例對於電解液中三碘離子還原反應的催化行為有明顯的差異,並且會進一步影響染敏電池的效率。 PtPd nanocrystals (NCs) with various alloying compositions are strategically prepared through the chemical method and exploited as counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). The photovoltaic results unveil the composition-dependent trend with a volcano-shaped plot of Pt5Pd5 NCs > Pt7Pd3 NCs > Pt3Pd7 NCs > Pt1Pd9 NCs. Among these NCs, the Pt5Pd5 NCs used as CEs in the DSSC exhibit the highest power conversion efficiency (PCE) of 9.8%, which was superior to the PCE of 7.6% obtained from the reference DSSC with the Pt CE in this study. Also, the electrochemical results reveal the composition-dependent activity along with a volcano-shaped trend in the I−/I3− redox reaction. Further theoretical works support that the catalytic activities of I3− reduction follow a sequence of Pt5Pd5 (111) surface > Pt7Pd3 (111) surface > Pt3Pd7 (111) surface > Pt1Pd9 (111) surface. The combination of electrochemical and theoretical results thus firmly indicate that the composition of PtPd alloying NCs plays an important role in determining their activities toward the I3− reduction reactions and hence the performance of DSSCs. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/53595 |
DOI: | 10.6342/NTU202002416 |
全文授權: | 有償授權 |
顯示於系所單位: | 化學系 |
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